Mailing List Archive Mailing List Archive
> You're diving on an ocean wreck, depth about 130', with fairly good
> visibility and a slight current. After racking up a moderate amount of
> decompression, you begin your ascent. As you ascend, you notice the
> current becoming a bit stronger; when you finally get to your first
> stop, at 30', you are holding on to the ascent line with both hands
> so you won't get swept away -- the current has really picked up since
> you started your dive. You can't even let go with one hand long enough
> to get your jon line out, and about halfway through your 40 minute hang,
> your arms _hurt_ and you feel that you just can't hold on any longer.
>
What is a jon line??? Not a term I am familiar with.
Well puting aside the obvious answer of you should have accounted
for this, realised the potential problem and solve it, in the
preparation for the dive,
WE are all Human arn't we
I do not know any thing about the bathymetry of the site, so I will
ignore this, however ir the current was racing to get over the edge,
(contentinental shelfedge) and this was not far < 200m) the below situa
situation may change. ( the current will dissapate as IT goes over the
shelf).
So here is what I would do
I first make an asumption that the person is me and my buddy,
and I have the associated equipment with me that I carry for
40m wreck diving in the U.K.
Not fair I here you shout---Why not I ask I am solving it for me.
First and formost I am assuming that I have some strength left.
1
Desend to a depth where the current is not as strong, I realise that
means an increased decompression penalty, but if you are diving on the
rule of thirds with and independant air supply this should be no
problem, That is to say you should have at least 6-7 litres spare @ 300bar.
If I though that I would be able to survive in the current, without
having my mask and reg ripped from my mouth, and knowing that the
boat was hopefully above, I would attach myself to the shot line
with the line clip and assend again, with no stress upon my arms.
Susposing that the current was to fierce for the above answer
I am left with 3 possible solutions,
1
Last ditch and least favourate, free ascent of the line, trying
complete the decompression requirement as best as possible.
However getting picked up by the boat may be a major problem
Now it depends upon whether or not i ***KNOW*** that I am in the
last pair to come up the line.
If so
3 Cut the line, and assend with the boat hopefully following you were ever
you may wander
2 If not (as is usually the case, unless you are diving one pair at a time
and know this will be the case), inflate the delayed surface marker buoy
and send it up one the smb reel or penitration reel, then follow this up
taking in decompression as you assend.
The answers to the above SHOULD be evident at that time, and hopefuuly it
will not take that long to desend and return, hence the extra penalty will
be minimal. At least well within you air margins
If you go let go,
then just go with the flow trying to get some marker on the surface,
so the boat can follow you.
Out of experience, however, you may still surface about 2miles from
the boat if the dec stops are long.
Ps if you have ever seen a three tonne buoy at 15m,
because of the current you, will appreciate ho strong a current can be.
Also be wary of buoy tied with steel hawser and not rope, it is usually
for a reason!!!!
Not diving that wreck again, with out consulting the tide tables!!!
Well I live and learn.
To Rick
If you are thinking about whaT I was thinking about when I read
6. What kind of backpack/B.C am I wearing?
Nice Idea, but pretty desperate,
However desperate measures for desperate time,
and
Neccessiity is the MOther of invention
P.s. how long is the hose on your octopus, as another option
mine in 2.5m, .5m to short
*************************************************************************
_/_/_/ _/_/_/ _/_/_/_/ tow@uk*.ac*.nb*.ua*
_/ _/ _/ _/ _/ _/ PROUDMAN OCEANOGRAPHIC LABORATORY
_/ _/ _/ _/ _/ BIDSTON,MERSEYSIDE
_/ _/_/_/ _/ _/ ENGLAND. L43 7RA
To roads diverged in a yellow wood, and I,
I take the one less travelled by, and that makes all the difference.
**************************************************************************
Navigate by Author:
[Previous]
[Next]
[Author Search Index]
Navigate by Subject:
[Previous]
[Next]
[Subject Search Index]
[Send Reply] [Send Message with New Topic]
[Search Selection] [Mailing List Home] [Home]